Heat Controller VMH09SC-1 Service Manual page 38

Service Manual
E2:
9.2.3 Zero crossing check resistance or inverter compressor, it is .7Ω error
Alarm signal when the main chip can't detect over-zero signal. When such failure occurs, the main control
board must have fault.
Turn off the power supply for 5
seconds, then turn it back on.
Check power supply and
connections
Indoor PCB defective
Shut off the power supply and turn on it
The unit does not work normally
Turn off the unit, rotate the
cross fan. Does it rotate
Yes
Is the fan motor connector and
connection good?
Yes
Is voltage being applied to the
fan motor?
No
Replace the PCB
VMH SerieS
Yes
No
N
Yes
No
Correct power supply or
E3: INDOOR OR E7 OUTDOOR
9.2.4 Fan speed has been out of control diagnosis
Disassemble the connection
between fan and motor, check
bearing. If bad, change the
bearing. If ok, follow the below
Replace the fan motor
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38
Heat Controller, Inc.
correct connections